Halogenation of β-Alkoxyvinyl Polyhaloalkyl Ketones: A Convenient Route for the Synthesis of α-Chloro- or α-Bromo-β-alkoxyvinyl Polyhaloalkyl Ketones
作者:Igor I. Gerus、Liliya M. Kacharova、Sergei I. Vdovenko
DOI:10.1055/s-2001-11435
日期:——
A number of α-chloro- and α-bromo-β-alkoxyvinyl polyhaloalkyl ketones 4 and 5 were synthesized in high yields by halogenation of β-alkoxyvinyl polyhaloalkyl ketones 1 with chlorine or bromine and further dehydrohalogenation of dihalo-intermediates 2 and 3 with pyridine. The Z configuration of ketones 4 and 5 was deduced from X-ray analysis and NMR spectra. Some typical nucleophilic reactions of the title compounds 4 and 5 with amines were carried out to check their reactivity.
通过氯或溴对δ-烷氧基乙烯基多卤烷基酮 1 进行卤化,并进一步用吡啶对二氢中间体 2 和 3 进行脱氢卤化,高产率地合成了一些δ-氯和δ-溴烷氧基乙烯基多卤烷基酮 4 和 5。根据 X 射线分析和核磁共振光谱推断出了酮 4 和酮 5 的 Z 构型。标题化合物 4 和 5 与胺进行了一些典型的亲核反应,以检验它们的反应活性。